Pump



Oct; 3o, 192s. 1,689,270

J. W. WOODRUFF PUMP Filed sept is, 1926 2 yf* m Patented Oct. 30, 1928.

UNITED STATE-S PATENT OFFICE.

JOSEPH W. WOODRUFF, OF ELIZABETH, NEW JERSEY.

PUMP.

Application led September 18, 19.26. Serial No. 136,222.

' without possibility of the parts of the pump becoming stuck or jammed by each other or by the heavyliquid being pumped.

Further objects are to provide a pump of this character which embodies a novel and improved valved piston which includes only two relatively slidable tubes or sleeves ot' large cross section and having large passages for the liquid being pumped so that the dificulties which would be encountered with the usual types of check valves or the like in pumping heavy or viscous liquids, are eliminated; to thus provide a valved piston including a tube which serves as the outlet for the pump and also as thev piston rod and telescop# ically cooperates with the ported sleeve and is itself ported so that upon relative movements of said tube and said sleeve the ports of each are so located that thc tube and sleeve serve as a piston to eject the liquid through the tube upon movement in one direction, while upon movement in the other `direct-ion the liquid is drawn into the pump cylinder, and to obtain other results and advantages as may be brought out by the following descriptions.

Referring to the accompanying drawing, in which corresponding and like parts are designated throughout the several views by the same reference characters- Figure l is a vertical longitudinal sectional view through a pump embodying the invention, showing the piston at the limit of its liquid ejecting stroke;

Figure 2 is a fragmentary vertical sectional view of the inlet end of the pump showing the piston at the limit of its intake stroke;

Figure 3 is a horizontal sectional view, taken on the line 3 3 of Figure l, and

Figure 4 is a view similar to Figure 2 taken on the line 4 4 of Figure 2.

Specifically describing the present embodiment of the invention, they reference character 1 designates the `cylinder ofl the pump which 4iii preferably formed of a straight tube and has one end closed as at 2 in any suitable manner, ior instance by a plug. Intermediate its ends the cylinder l is provided with a plurality of transverse openings 3 in its walls disposed in substantially the same transverse plane said openings serving as inlets for the pump cylinder.

The piston of the pump includes a piston sleeve 4 and an outlet and operating tube or plunger 5. The piston sleeve 4which is also preferably formed of a straight tube is reciproca'ble wit-hin the cylinder 1 and has a sliding lit therewith, saidsleeve preferably being shorter than the cylinder l. The sleeve 4 is provided with a plurality of slots 6 spaced from one end ot the sleeve and of a lengt-h sulicient to maintain communication o'f said slots with the openings 3 in the cylinder when the sleeve is adjacent the closed end 2 of the cylinder, as shown in Figure 1.

The tubev 5 is reciprocable within the sleeve 4 and has a sliding fit therewith, said tube extending the full length of the cylinder' and beyond the open end thereof, as shown in Figure l. The outer end of the tube serves as t-he outlet of the pump and may be connected in any suitable manner to the point to which it is desired to pump the liquid being handled. For most purposes, a spout 7 may be connected to vthe tube 5, as shown on the drawings. The inner end of the tube 5 is closed as at 8 and the tube 5 is provided with openings 9 in spaced relation` to said inner end and is-so arranged as to open and close the slots 6 in the sleeve 4 to permit the ow ot liquid through the openings 3A in the cylinder and the slots 6 into the lower end of the'cylinder and cause said liquid to be ejected through the outlet tube, respectively, upon movement of the tube in opposite directions. For this purpose, the. tube 5 isr capable ot movement relatively to the sleeve 4, said movement being limited the direction of they outL ward or upward stroke of the tube 5 bya transverse pin l() in the tube movable in the slots 60 of the sleeve which alsoiprevents relative rotation of the tubean'd the sleeve, and said relative movement being limited in the other direction by engagement of a collar 1l fast on the tube 5 with the outer en'd of the sleeve 4 so that said openings 9 may pass beynd the lower ends o'fsaid slots 6. l The slots 60 are always closed by the sleeve 4 and theertent otrelatve movement of the tube 5 `and Sleeve fr is met that uw @pairings e' emmer communicate with the slots 60. The openings 9 are arranged so as to be always out of communication with the slots 6.

In operation of the pump, the cylinder is inserted into the container from which the liquid is to be pumped, for instance through the bung hole of a barrel containing oil, and the tube 5 drawn outwardly of the cylinder 1 into substantially the position shown in Figure 2. The oil in the barrel or like container flows through the openings 3 and slots 6 beneath the inner end of the tube 5 into the lower end of the cylinder. rllhe tube 5 is then forced inwardly of the cylinder and initially moves independently of the sleeve 4 so that the openings 9 pass completely beyond the lower ends of the slots 6 and said slots and the sleeve are closed off from the inner end of the cylinder, after which the collar 11 strikes the upper end of the sleeve 4 and the sleeve and tube 5 move together. The liquid is thus forcee outwardly from the inner end of the cylinder through the openings 9 in the tube 5, into the tube and from spout 7. As the tube 5 is next pulled outwardly ofthe cylinder the tube first moves independently of the sleeve 4t to open the slots 6, until the pin 10 strikes the upper ends of said slots, after which the tube 5 and sleeve l move together to the position shown in ure 2, whereupon the liquid again flows into the lower end ofthe cylinder. It will be noted that the slots 6 are always in communication with the openings 3 in the cylinder and that the initial opening of the slots 6 by the tube 5 on the outward stroke prevents the formation of a partial vacuum in the lower end of the cylinder which would retard if not prevent the piston from being moved outwardly of the cylinder. Furthermore, the particular arrangement provides for the ejection upon each operation of the piston of an amount of liquid predetermined by the capacity of the portion of the cylinder below the openings 3.

Preferably, a bearing sleeve 12 is fitted in the outer end of the cylinder to gui-de the tube 5 and also to close the cylinder'.

Any suitable means may be provided for reciprocating the piston of the pump, but for the purposes of illustration have shown a lever 13 pivoted at one end as at 14 to a bracket 15 secured to the outer end of the cylinder 1, said lever having a pin and slot connection 16 with a collar 17 fast upon the outer end of the tube 5. Obviously, oscilla tion of the lever 13 will cause reciprocation of the tube 5.

It will be noted that the parts of the pump are extremely simple and strong so that a maximum pumping power for ejecting the liquid through the outlet tube is obtained with a minimum expenditure of energy on the lever 13. The inner end of the tube 5 and the sleeve 4 provide in effect a valved piston, and comprise only two straight tubes or sleeves having transverse ports 6 and 9 therein, the inner extremity of the tube 5 and the inner end of the sleeve 4 forming the effective piston area for ejecting the liquid from the pump and the inner ends of the tube and the sleeve together with the ports 9 in the tube and the ports 6 in the sleeve serving as a valve for controlling the flow of liquid into the pump cylinder from the barrel or the like and from the pump cylinder through the outlet tube 5. The valve thus formed is simple and positively operated directly through the tube 5 and by the same power which operates the piston for ejecting the liquid. There is little possibility, therefore, of the valve mechanism becoming stuck, and the construction is both reliable and durable in operation.

Preferably the tube 5 is formed in two sections 50 and 51, and the collar 11 is preferably in the form of a coupling for connecting the two sections 50 and 51, this coupling being slidable within the cylinder 1 and serving also as an intermediate bearing for the tube 5. While I have shown and described the pump as embodying certain details of construction, it will be understood that this is primarily for the purpose of illustrating the principles of the invention and that many modifications and changes can be made in these details without departing from the spirit or scope of the invention. Therefore, l do not desire to be understood as limiting myself except as required by the following claims when construed in the light of the prior art. l

`llaving thus described. the invention, what l claim is:

1. A pump comprising a` cylinder closed at one end and having an inlet opening in spaced relation to said closed end, a plunger in said cylinder' having a longitudinal channel closed at its inner end and lateral openings into said channel adjacent said inner end, a sleeve slidable in said cylinder and upon said plunger adapted to close and open said openings upon the outward and inward strokes of said plunger respectively, a passage being provided between said inlet opening and said closed end of the cylinder, and means for limiting movement of said sleeve relatively to said plunger whereby communication through said passage between said inlet opening and the closed end of said Cylinder is established on the outward stroke of said plunger and cut off on the inward stroke and communication between said closed end of the cylinder and said channel in the plunger is established on the inward stroke and cut ott1 on the outward stroke.

2. A pump comprising a cylinder closed at one end and having an inlet opening in spaced relation to said closed end, a tubular piston sleeve reciprocable in said cylinder' and having a sliding fit therewith, said sleeve having a slot spaced from the inner end thereof to establish communication between said inlet opening and the passage through said sleeve, an outlet and operating tube slidably fitting within said piston sleeve having its inner end closed and a transverse opening in its walls in spaced relation to said inner end, means connecting said piston sleeve and said tube for movement together and to permit limited relative movement thereof in opposite directions so that upon movement of said tube relatively to said sleeve inwardly of said cylinder said opening in the tube is located beyond the inner end of said sleeve to close olf said sleeve and upon movement of the tube in the other direction the inner end thereof opens said slot in the sleeve for communication with the inner end of said cylinder, and means for reciprocating said tube.

3. A pump comprising a cylinder closed at one end and having an inlet opening in spaced relation to said closed end, a tubular piston sleeve reciprocable in said cylinder and having a sliding lit therewith, said sleeve having a slot spaced from the inner end thereof to establish communication between said inlet opening an-d the passage through said sleeve, an outlet and operating tube slidably itting within said piston sleeve having its inner end closed and a transverse opening in its Walls in spaced relation to said inner end, means connecting said piston sleeve and said tube for movement together and to permit limited relative movement thereof in opposite directions a distance greater than that between the inner end of said tube and the outer edge of said opening in the tube, and means for reciproeating said tube.

4. A pump comprising a cylinder closed at one end and having an inlet o Jening in spaced relation to said closed end, a tubular pistonr sleeve reciprocable in said cylinder and having a sliding lit therewith, said sleeve having tivo circumferentially spaced slots also spaced from the inner end thereof and one to establish communication between said inlet opening and the passage through said sleeve, an outlet and operating tube slidably fitting within said piston sleeve and having its inner end closed and a transverse opening in its walls spaced lfrom said inner end and out of communication with said slots in said sleeve, a pin projecting from said outlet tube and movable in the other of said slots in said sleeve to permit limited movement of said tube relatively to said sleeve in one direction to permit communication of said sleeve and the firstwmentioned slot with the inner end of said cylinder' and to cause movement of said sleeve with said tube in said direction thereafter,

JOSEPH W. WOODRUFF. 

